Following the method of 18, reduce A to echelon form and look at zero rows. The b column
Chapter 3, Problem 19(choose chapter or problem)
Following the method of 18, reduce A to echelon form and look at zero rows. The b column tells which combinations you have taken of the rows: [ 1 2 (a) 3 4 4 6 (b) 1 2 2 3 2 4 2 5 From the b column after elimination, read off m - r basis vectors in the left nUllspace. Those y's are combinations of rows that give zero rows.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer